Most great jazz musicians were trained in classical music. So do you need to learn classical music first before you can play jazz? Or is playing jazz about learning shapes and harmony, technique and structures, the things required to play any music well. There shouldn’t be a separation between classical and jazz; the creation and performance of music is the same regardless of the genre. Classical Music’s role for jazz musicians is in its long tradition of attempts at solving technical issues; it is a great resource for jazz musicians.